/*
  占位控件
 */

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'PlaceHolder',
      home: Scaffold(
        appBar: AppBar(title: Text('PlaceHolder'),),
        body: Container(
          child: Column(
            children: [
              SizedBox(
                height: 100,
                width: 100,
                child: Placeholder(),
              ),
              Text('这是标题')
            ],
          ),
        ),
      ),
    );
  }
}
